irritant

1 of 2

noun

ir·​ri·​tant ˈir-ə-tənt 

: something that irritates or excites

irritant

2 of 2

adjective

: causing irritation

specifically : tending to produce physical irritation

Synonyms

Noun

• aggravation
• aggro [British]
• annoyance
• bother
• botheration
• bugbear
• exasperation
• frustration
• hair shirt
• hassle
• headache
• inconvenience
• irk
• nuisance
• peeve
• pest
• rub
• ruffle
• thorn
• trial
• vexation

Examples of irritant in a Sentence

Noun

dust and other lung irritants

The delay was a minor irritant.

Recent Examples on the Web

Noun

It's usually caused by long-term exposure to environmental irritants such as cigarette smoke, chemicals, allergens, air pollution and dust, explains Dr. Kunal Bakshi, a primary care physician at Rush University Medical Center in Chicago. —Daryl Austin, USA TODAY, 12 Mar. 2025

Environmental factors: Exposure to irritants such as cigarette smoke, air pollution, or chemical fumes can increase your risk. —Lindsay Curtis, Health, 5 Mar. 2025

Adjective

Wait for the foliage to yellow and die back, and wear gloves; the sap can be a skin irritant. —Andy Wilcox, Better Homes & Gardens, 16 Mar. 2025

McBride starting in place of Brunson adds another disruptive defensive irritant. —Kristian Winfield, New York Daily News, 10 Mar. 2025

Word History

First Known Use

Noun

1802, in the meaning defined above

Adjective

1636, in the meaning defined above

Kids Definition

irritant

1 of 2 adjective

ir·​ri·​tant ˈir-ə-tənt 

: tending to produce anger, annoyance, impatience, soreness, or inflammation

especially : tending to produce physical irritation

irritant

2 of 2 noun

: something that irritates

Medical Definition

irritant

1 of 2 adjective

ir·​ri·​tant ˈir-ə-tənt 

: causing irritation

specifically : tending to produce inflammation

irritant

2 of 2 noun

: something that irritates or excites

specifically : an agent by which irritation is produced

a chemical irritant